A HIIT Interval Timer is an Android app. This main purpose of this app is for the user to be able to time his or her workouts. This app does not collect any data from the user.
When the user receives a phone call, the workout is automatically paused. To detect the incoming call, the app needs to use the PHONE_STATE permission. The app does not store any information about the incoming call (such as phone number, call duration, etc.)
The app uses AdMob to show ads. You can find the privacy policy for AdMob here